Richland Township is one of fifteen townships in DeKalb County, Indiana. As of the 2020 census, its population was 1,235, down from 1,333 at 2010, and it contained 510 housing units.
Richland Township was organized in 1837.
According to the 2010 census, the township has a total area of , of which (or 99.66%) is land and (or 0.34%) is water. Burdick Lake, Depew Lake, Haynes Lake and Lintz Lake are in this township.
The township contains two cemeteries: Corunna and Sedan.